Spindle motor

Abstract

Disclosed herein is a spindle motor including a shaft forming a rotation center of the motor; a sleeve receiving the shaft therein and rotatably supporting the shaft; a thrust plate coupled to the sleeve in a direction vertical to an axial direction, wherein the thrust plate includes a friction reducing coating layer formed thereon. According to the present invention, the coating layer for reducing friction force is formed on the thrust plate of the spindle motor, such that friction force generated when the spindle motor is repeatedly and sequentially stopped, operated, and stopped may be effectively reduced, such that operational performance of the spindle motor may be improved.

What is claimed is: 
     
         1 . A spindle motor comprising:
 a shaft forming a rotation center of the motor;   a sleeve receiving the shaft therein and rotatably supporting the shaft;   a thrust plate coupled to the sleeve in a direction vertical to an axial direction;   wherein the thrust plate includes a friction reducing coating layer formed thereon.   
     
     
         2 . The spindle motor as set forth in  claim 1 , wherein the friction reducing coating layer is formed on the thrust plate facing the sleeve. 
     
     
         3 . The spindle motor as set forth in  claim 1 , wherein the friction reducing coating layer is formed by a self-assembled monolayer (SAM) coating method. 
     
     
         4 . The spindle motor as set forth in  claim 1 , wherein the friction reducing coating layer is formed by a method including:
 removing organic materials from the surface of the thrust plate in a hexane solution;   performing surface-treatment in a piranha solution for surface activation of the thrust plate;   dipping the thrust plate into a solution obtained by diluting an octadecyltrichlorosilane (OTS) SAM solution with a hexadecane solution at a concentration of 1 mM to coat the surface thereof;   removing residues from the thrust plate with an isopropyl alcohol (IPA) solution; and   washing the thrust plate with de-ionized (DI) water.   
     
     
         5 . The spindle motor as set forth in  claim 4 , wherein the method further includes removing the organic material from the surface of the thrust plate in the IPA solution, after the removing of the organic materials from the surface of the thrust plate in the hexane solution. 
     
     
         6 . The spindle motor as set forth in  claim 1 , wherein the friction reducing coating layer is formed by a method including:
 removing organic materials from the surface of the thrust plate in a hexane solution;   performing surface-treatment in a piranha solution for surface activation of the thrust plate;   dipping the thrust plate into a solution obtained by diluting an 1H,1H,2H,2H-Perflurodecyltrichlorosilane (FDTS) SAM solution with an iso-octane solution at a concentration of 1 mM to coat the surface thereof;   removing residues from the thrust plate with an IPA solution; and   washing the thrust plate with DI water.   
     
     
         7 . The spindle motor as set forth in  claim 6 , wherein the method further includes removing the organic material from the surface of the thrust plate in the IPA solution, after the removing of the organic materials from the surface of the thrust plate in the hexane solution.